H265-VS-H264

H.264 vs. H.265

H.265 VS H.264: Comparison between H.265 (HEVC) and H.264 (AVC)

The rise of 4K and 8K videos throws down a challenge to the current video compression standard H.264 since it no longer manages to encode Ultra HD videos at a satisfactory bit rate than the HD content. Contrarily, the next-gen H.265/HEVC video compression standard gains upper hand over H.264, thanks to its better compression efficiency. H.265 (HEVC) allows 50% reduction of bit rate yet delivers the same video quality as H.264 AVC.

So to speak, H.265 is becoming the most commonly used formats for video compressing, distributing and recording 4K/8K UHD contents, let alone the HD/SD videos. Yet what is H.265? How much do you know about this H264 successor? Any further difference between H265 and H264? This post will throw light on the differences between the two standards H.265 and H.264, based on file size, bandwidth usage, bit rate, quality and compatibility.

What is H.265 (HEVC)?

H.265 is also called High Efficiency Video Coding (HEVC). As its name suggests, H.265 is twice high efficiency than H.264 when encoding video. Namely, it halves the bit rate at the same level of video quality compared with its predecessor. It is targeted at next-generation HDTV displays and content capture systems which feature progressive scanned frame rates and display resolutions, as well as improved picture quality in terms of noise level, color spaces, and dynamic range.

What is H.264 (AVC)?

H.264 or MPEG-4 AVC is a video coding format that is currently one of the most commonly used formats for video content compression and delivery. H.264 reported bit rate savings of 50% or more compared with its predecessor MPEG-2 Part 2. It has a a wide range of applications, covering all compressed video ranging from low bit-rate streaming applications (YouTube, iTunes, Vimeo, Facebook, Instagram) to various HDTV broadcasts over terrestrial, cable, and satellite. It is also commonly used for Blu-ray Discs, DVD storage, IP packet network, and digital cinema applications with nearly lossless coding.

H.265 vs H.264: Compression Ratio

According to wiki and official test, what differs H.265 from H.264 is the compression efficiency. H.265 (aka HEVC) doubles the coding efficiency compared with its predecessor H.264. This means H.265 video saves around 50% of the bit rate at the same quality of coding. Specifically, the average bit reduction for H.265 is 64% at 4K UHD, 62% at 1080p, 56% at 720p and 52% at 480p. So if you download HEVC H265 movies instead of H264 movie, you can play HEVC on iPhone Android device with 50% storage saved. And the movie quality won't be affected at all.

H.265 vs H.264: Bandwidth Use

H.265 is superior to H.264 regarding to the bandwidth usage. Because H.265's algorithm uses the efficient coding, H.265 promises approximately 40-50% of reduction in transmission bandwidth needed to compress the video (e.g. in 720p) over H.264 at the same video quality. Generally, it requires 32 mbps bandwidth to stream 4K H264 video while it only consumes 15 mbps to broadcast 4K HEVC video. So you can enjoy 4k video smoothly even at congested network connection. >> Check the free X265 vs X264 review.

H.264 vs H.265: Quality

The big difference between H.265 and H.264 lies in the video quality at the same bit rate. In H.264, the border areas of the block are likely to be distorted, because each macroblock is fixed and the data is independent to each other. While H.265 offers sharper detailed on faces and fabrics and smooth gradient areas with less blocking and fewer artifacts, since the new standard determines the size of code unit based on regional information. So H.265 is better than H.264 when it comes to compress a video with better image quality.

HEVC vs H.264: File Size

The great compression ratio also has a great relationship with the digital storage requirement of video streams and transmission. The reduced bandwidth leads to smaller file size. Test shows a video encoded with H.264 is 1-3X larger than H.265. This is favorable for hard drive storage or the device with limited storage space required to house the video data.So H.265 advantages over H.264 in this regard.

HEVC vs H.264: Compatibility

Nothing is perfect. Neither is HEVC. The content we talk about above is HEVC advantages over H264. Well, here will show you the HEVC/H265 disadvantage - poor compatibility. Currently, HEVC is nowhere near as popular as H264. If we say the current devices and platforms that support H264 codec account for 99%, then the proportion of those that support H265 codec might be about 30% - 40%. If you still keep skeptical about its compatibility, please check the basic requirements of HEVC video decoding and playback below:

HEVC vs H.264: Performance Comparison

H.265 vs H.264, which one is more suitable for you for videos playback? Of course, H.264 codec is applicable for almost all common devices. But things are not feasible to H.265. For devices that can decode HEVC video, performance is a concern. Here we tested the performance of various devices on average CPU usage, median clock speed and battery life for a reference of final decision of H.265 and H.264.

H.265 vs H.264 Comparison Table

Conclusion:

H.265 has many advantages over H.264, e.g. It supports up to 8K UHDTV (8192×4320 maximum), 4:4:4 and 4:2:2 chroma sub-sampling, supports up to 300 fps (earlier versions only supported up to 59.94 fps), data rates of several GB/s, and file size 'subjectively' half the size of H.264 with better quality! The H.265 has potential impact on accellerating 4k screens demand and sale, offering higher quality video even in bandwidth constrained network, etc.

There is aslo a downside in H.265 that H.264 is no problem at all. The former takes longer to encode a video when compared to H.264. So if you go a H.265 encoder, you may experience longer encoding time. Secondly, Since H.265 is a codec of the future, not wildly used now, watching H.265 videos is not as simple as it seems. H.265 is so far acceptable by iPhone 6 or letter, Windows 10, Roku 4, Amazon Fire TV, Xbox One. There are still a large number of protects that cannot recognize the media library encoded with H.265. So converting H.265 to H.264 is still highly demanded nowadays.

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